The main function in the circulatory system is to carry blood and dissolved substances (oxygen, vitamin, carbon dioxide, and etc. to and from different places in our body's. Our circulatory system has two parts.
The heart pumping blood and other substances into the body. The heart has four chamber 2 atria and 2 ventricles.
Blood Vessels
The tubes or passage way the pass the pumped blood and substance to the body.
There are three types of blood vessels:
- Vein brings blood toward heart, smallest blood vessels. they have valves to prevent blood pump in the wrong direction. body muscles surround veins so that the push the blood along to the vessels.
- Arteries carry blood away from heart. They have thick muscle and elastic fibers. The elastic fibers allow the arteries to stretch under pressure and thick muscles allow it to contract and to push blood around.
- Capillaries link arteries and veins exchange materials through the blood and body cells. the cell wall of a capillary is on one cell thick. a collection of capillaries is a capillary bed.
Components Of Blood
digested food
red blood cells
oxygen
white blood cells
urea
platelets
hormones
plasma and carbon dioxide
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